100% polyester; UA Tech fabric is quick-drying, ultra-soft & has a more natural feel; Moisture Transport System wicks sweat & dries fast; Anti-odor technology prevents the growth of odor causing microbe; Four-way stretch fabrication allows greater mobility in any direction; Improved Fit: plus 1' across waist, plus 1/2' sleeve length; Integrated locker loop; UA logo on top front chest and back neck; Updated version of style 1268481